Cyclic AMP-specific phosphodiesterase inhibitors
a phosphodiesterase inhibitor and amp-specific technology, applied in the field of cyclic amp-specific phosphodiesterase inhibitors, can solve the problems of emesis and central nervous system disturbance, unsolved efficacy and adverse side effects, compound non-selective pde inhibition, etc., and achieve the effect of reducing or eliminating adverse cns side effects
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example 1
(±)-4-(3-Cyclopentyloxy-4-methoxyphenyl)-3-(1-hydroxy-1-methylethyl)-3-methylpyrrolidine-1-carboxylic acid methyl ester
[0196]To a 3.0 M solution of methylmagnesium bromide (0.6 mL, 1.8 mmol) in Et2O at 0° C. was added a solution of Intermediate 36 (0.65 g, 1.73 mmol) in dry THF (5 mL), dropwise via a syringe pump. The resulting mixture was stirred at 0° C. for 30 minutes, then at room temperature for 1 hour. The reaction mixture then was quenched with saturated NH4Cl (15 mL) and extracted with Et2O (2×10 mL). The combined organic extracts were dried over Na2SO4 and concentrated. The residue was purified by flash chromatography (silica gel, 20% EtOAc-hexanes, then 50%) to provide Example 1 as an orange oil (0.37 g, 55%).
[0197]1H NMR (300 MHz, CDCl3) δ: 6.83–6.77 (m, 3H, aromatic), 4.75–4.74 (br. m, 1H), 3.83 (s, 3H, OCH3), 3.96–3.50 (m,4H), 3.73 (s, 3H, OCH3), 3.37–3.25 (m, 1H), 1.96–1.59 (m, 8H, cyclopentyl), 1.22 (s, 3H, CH3), 1.07 (s, 6H, CH3).
Intermediate 30
2-[1-Benzyl-4-(S)-(3-...
example 2
1-[4-(S)-(3-Cyclopropylmethoxy-4-methoxyphenyl)-3-(1-hydroxy-1-methylethyl)-3-(S)-methylpyrrolidin-1-yl]-2-hydroxyethanone
[0204]Intermediate 32 (21 mg, 45 μmol) was dissolved in ethanol (95%, 2 mL) and treated with Pearlman's catalyst (20% Pd(OH)2 on carbon, 20 mg). The solution was subjected to 1 atmosphere of H2 for 20 hours. The catalyst was removed by filtration and concentrated in vacuo, to afford Example 2 (15 mg, 88%).
[0205]1H NMR (CDCl3, 400 MHz) δ: 6.87–6.80 (m, 3H), 4.20–4.09 (m, 2H), 3.89–3.62 (m, 9H), 3.58–3.51 (m, 1H), 3.13–2.87 (m, 2H), 1.35–1.01 (m, 10H), 0.67–0.61 (m, 2H), 0.39–0.33 (2H). LRMS (Electrospray, positive): Da / e 378.4 (m+1).
Intermediate 33
1-[1-Benzyl-4-(S)-(3-cyclopropylmethoxy-4-methoxyphenyl)-3-(S)-methylpyrrolidin-3-yl]ethanone
[0206]Oxalyl chloride (2.0M in CH2Cl2, 1.35 mL, 2.7 mmol) was added to CH2Cl2 (4 mL) and the solution was cooled to −60° C. A solution of DMSO (0.36 mL, 5.0 mmol) in CH2Cl2 (1.5 mL) was added slowly. This solution was stirred fo...
example 3
[0329]Preparation of four stereoisomers from reduction of Intermediate 36. Sodium borohydride (2.0 mmol, 0.075 g) was added to Intermediate 36 (1.3 mmol, 0.50 g) dissolved in 10 mL of ethanol. The complete reaction was dried in vacuo after 1 hour. The resulting oil was extracted three times with EtOAc from water, then the combined extracts were washed with brine and dried over MgSO4. The mixture of two racemates was obtained as an oil.
[0330]1H NMR δ: 6.80 (d, 1H); 6.67 (d, 2H); 4.72 (bd, 1H); 3.86–3.95 (bm, 1H); 3.83 (s, 3H); 3.64–3.78 (bm, 1H); 3.74 (s, 3H); 3.33 (dd, 1H); 2.16 (d, 3H); 1.79–1.92 (bm, 4H); 1.59–1.63 (bm, 2H); 1.01 (sd, 3H).
[0331]The mixture of racemates was dissolved in 50% acetonitrile and 50% water at a concentration of 50 mg / mL and purified in portions on a C-18 column (250×10 mm) using a water / acetonitrile / 0.5% TFA gradient. Appropriate fractions were collected, combined, and dried to oils.
[0332]1H NMR for minor racemate δ: 6.75–6.82 (bm, 3H); 4.75 (bd, 1H); 3....
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